stock duramax
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Join Date: Dec 2010
Location: Fool's Golden State
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when my truck was stock i got 15ish around town and about 20~21 highway. now with my EFI live tuning and other mods (signature) i'm around 16~17 in town and 22 highway. this is unloaded. haven't done enough towing to get accurate numbers, but the last time i think it was around 14 with EFI Live. no stock towing numbers, sorry.
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